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v3.22.2.2

Commitments and Contingencies (Detail) - USD ($) $ in Millions | Mar. 26, 2021 | Sep. 30, 2022
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Reinsurance Retention Policy [Line Items] |  |
Term of reinsurance agreement | 3 years |
Reinsurance Contracts: 2023-01-01 |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance payable, due in fiscal year |  | $ 105.6
Reinsurance Contracts: 2024-01-01 |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance payable, due in second year |  | 157.5
Reinsurance Contracts: 2025-01-01 |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance payable, due in third year |  | $ 66.3

X
- Definition Amount of commitment classified as other to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

X
- Definition Amount of commitment classified as other to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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X
- Definition Amount of commitment classified as other to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Other Commitment, Term + References No definition available. + Details
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Namespace Prefix: | uve_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |